Profession World Quests, including Herbalism, Skinning, Mining, First Aid, Fishing, Cooking, and Archaeology

Dungeon World Quests

PvP World Quests (Not required to complete Emissary quests)

Battle Pet World Quests

The quest icon helps to indicate what type of quest it is. Swords for PvP, Profession icons, Battle Pet icons, and then different rarity colors and borders around the normal quest icon. The dragon border usually indicates a group is required.

World Quest Emissaries
Each Legion faction has an emissary that will ask you to do quests for their faction.

One faction has a set of emissary quests every day, requiring you to complete four quests for that faction to earn some reputation and a cache of loot.

Each set of emissary quests will be available for three days, so you can have up to three at once.